(SCF5) Bab 4 - Kadar Tindak Balas (4.1)

Apakah yang dimaksudkan dengan kadar tindak balas?
What is meant by rate of reaction?

• Jumlah bahan tindak balas digunakan / Total reactant used

• Perubahan kepekatan bahan per unit masa / Change in concentration per unit time

• Jumlah produk akhir / Final product amount

Apakah unit biasa bagi kadar tindak balas apabila gas dihasilkan?
What is the usual unit of rate of reaction when gas is produced?

• mol/dm³

• cm³/s

• gram/s

Tindak balas yang perlahan ialah:
A slow reaction is:

• Pembakaran magnesium / Burning of magnesium

• Letupan mercun / Firecracker explosion

• Pengaratan besi / Rusting of iron

Apakah yang boleh diukur untuk menentukan kadar tindak balas?
What can be measured to determine rate of reaction?

• Warna larutan / Solution colour

• Jisim awal bahan / Initial mass of reactant

• Isipadu gas terbebas per unit masa / Volume of gas released per unit time

Tindak balas yang cepat berlaku dalam:
A fast reaction occurs in:

• Fotosintesis / Photosynthesis

• Neutralisasi asid dan alkali / Acid-base neutralisation

• Penapaian / Fermentation

Kadar tindak balas boleh diukur melalui:
Rate of reaction can be measured through:

• Perubahan suhu / Change in temperature

• Perubahan warna / Colour change

• Perubahan kuantiti bahan tindak balas atau hasil / Change in amount of reactant or product

Semasa tindak balas kimia, kadar tindak balas tertinggi berlaku pada:
During a chemical reaction, the highest rate occurs at:

• Permulaan tindak balas / Beginning of the reaction

• Pertengahan tindak balas / Middle of the reaction

• Tamat tindak balas / End of the reaction

Tindak balas A menghasilkan 100 cm³ gas dalam 20 saat. Apakah kadar tindak balasnya?
Reaction A produces 100 cm³ gas in 20 seconds. What is the rate of reaction?

• 5 cm³/s

• 2 cm³/s

• 20 cm³/s

Jika tindak balas menghasilkan endapan, kadar tindak balas boleh diukur melalui:
If a reaction produces a precipitate, the rate can be measured by:

• Warna larutan / Colour of solution

• Jisim hasil / Mass of product

• Masa larutan menjadi legap / Time taken to turn cloudy

Semakin banyak gas dihasilkan dalam masa singkat, maka:
The more gas produced in a short time,

• Lebih perlahan kadar tindak balas / Slower reaction rate

• Lebih cepat kadar tindak balas / Faster reaction rate

• Tindak balas tidak berlaku / No reaction occurs